Handle supportedFormatsChanged in QVideoSurfaces

Need to proxy supportedFormatsChanged signal from internal surfaces, since it impacts supported
formats, also GLContext property should be set to share gl contexts between renderers.

Change-Id: I9774be4d79dcd09190769def7e6ffd11a85fcc86
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/multimedia/video/qvideosurfaces.cpp b/src/multimedia/video/qvideosurfaces.cpp
index 459a6675a..793879382 100644
--- a/src/multimedia/video/qvideosurfaces.cpp
+++ b/src/multimedia/video/qvideosurfaces.cpp
@@ -45,6 +45,15 @@ QVideoSurfaces::QVideoSurfaces(const QVector<QAbstractVideoSurface *> &s, QObjec
     : QAbstractVideoSurface(parent)
     , m_surfaces(s)
 {
+    for (auto a : s) {
+        connect(a, &QAbstractVideoSurface::supportedFormatsChanged, this, [this, a] {
+            auto context = property("GLContext").value<QObject *>();
+            if (!context)
+                setProperty("GLContext", a->property("GLContext"));
+
+            emit supportedFormatsChanged();
+        });
+    }
 }
 
 QVideoSurfaces::~QVideoSurfaces()